| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [verb] happen | 427 |
|
| 2 | it [adv] happen | 405 |
|
| 3 | it [adv] happen | 403 |
|
| 4 | it [modal v] happen | 366 |
|
| 5 | it [vb mod] happen | 366 |
|
| 6 | it have happen | 341 |
|
| 7 | it [vb -s] happen | 208 |
|
| 8 | it [vb past] happen | 204 |
|
| 9 | it had happen | 171 |
|
| 10 | it be happen | 161 |
|
| 11 | it [be] happen | 161 |
|
| 12 | it [adj] happen | 102 |
|
| 13 | it [is] happen | 101 |
|
| 14 | it [det] happen | 101 |
|
| 15 | it all happen | 101 |
|
| 16 | it all happen | 101 |
|
| 17 | it so happen | 100 |
|
| 18 | it so happen | 100 |
|
| 19 | it could happen | 91 |
|
| 20 | it could happen | 91 |
|
| 21 | it 's happen | 88 |
|
| 22 | it will happen | 78 |
|
| 23 | it do happen | 69 |
|
| 24 | it has happen | 69 |
|
| 25 | it 's happen | 67 |
|
| 26 | it can happen | 66 |
|
| 27 | it just happen | 66 |
|
| 28 | it can happen | 66 |
|
| 29 | it just happen | 66 |
|
| 30 | it [was/were] happen | 60 |
|
